• NG = National Gallery (London)
• NGA = National Gallery of Art (Washington)
• NGC = National Gallery of Canada (Ottawa)
• NGI = National Gallery of Ireland (Dublin)
• NGO = Nationalgalleriet (Oslo)
• NGP = Národní Galerie v Praze (Prague)
• NGP = National Gallery in Prague (Prague)
• NGS = National Galleries of Scotland (Edinburgh)
• NGV = National Gallery of Victoria (Melbourne)